About the client:
Our customer is the European online car market with over 30 million monthly users, with a market presence in 18 countries.
As a Lead Active Directory Engineer, you will play a pivotal role in shaping the future of online car markets and enhancing the user experience for millions of car buyers and sellers.
Project Overview
We require a Lead Active Directory Engineer to assess, clean up, and harden multiple inherited single-forest, single-domain Active Directory environments.
These environments require standardization, security hardening, and alignment with current best practices.
The focus will be on improving AD structure, security posture, Group Policy hygiene, and operational consistency, while also evaluating long‐term viability and integration with enterprise IAM platforms.
This is a hands‐on senior role requiring deep expertise in Active Directory architecture, security, identity integration, and remediation of legacy configurations, including alignment with industry audit and compliance standards (e.g., PCI DSS).
Requirements
EDT Timezone work hours
Extensive hands‐on experience (typically 7+ years) with Active Directory engineering and administration
Proven experience performing AD clean‐up, consolidation, or post‐transition integration work
Strong expertise in:
Active Directory (single‐domain environments at scale)
Group Policy design, cleanup, and optimization
OU design and delegation models
Demonstrated experience with:
AD security hardening (tiered admin model, least privilege, attack surface reduction)
Identifying and remediating:
Stale objects (users, computers, groups)
Legacy permissions and misconfigurations
GPO sprawl and conflicts
Experience integrating Active Directory with IAM/IdP platforms, including:
Azure AD / Entra ID, Okta, etc
SSO, federation, and identity synchronization (e.g., AAD Connect or equivalent)
Role‐based access control (RBAC)



and identity lifecycle management
Experience working within regulated or audited environments, including:
PCI DSS (or similar frameworks such as ISO *****, NIST)
Implementing controls related to identity, access management, and auditability
Strong knowledge of:
Authentication protocols (Kerberos, NTLM, SAML/OIDC basics)
DNS (AD‐integrated), replication, and site topology
Experience with tools such as:
ADUC, ADSIEdit, Group Policy Management Console
PowerShell (AD module) for bulk changes and reporting
Experience in auditing and improving:
Privileged access (Domain Admins, Enterprise Admins)
Service accounts and delegation
At least upper‐intermediate English level
Responsibilities
Perform a comprehensive assessment of current AD environments
Identify and remediate:
Inactive/stale objects
Legacy groups and excessive permissions
GPO duplication, conflicts, and inefficiencies
Redesign and implement:
OU structure and delegation model
Group Policy strategy aligned to best practices
Implement security hardening measures, including:
Privileged access model (e.g., tiering)
Reduction of attack surface and legacy protocols
Alignment with audit/compliance requirements (e.g., PCI DSS controls)
Integrate AD environments with enterprise IAM platforms, including:
Identity synchronization and federation
Access model alignment (RBAC / least privilege)
SSO enablement and identity lifecycle processes
Review and optimize:
AD Sites and Services (replication topology)




DNS configuration and health
Develop and execute cleanup and remediation plans with minimal disruption
Automate tasks and reporting using PowerShell
Produce clear documentation and operational standards, including audit‐ready configurations
Expected Deliverables
Completed AD health assessment and remediation roadmap
Reduction in stale objects, legacy permissions, and GPO sprawl
Implemented hardened AD structure aligned with best practices and audit standards (e.g., PCI DSS)
Successful integration of AD environments with IAM platform(s), including SSO and identity lifecycle alignment
Improved security posture (privileged access, delegation, policies)
Documented AD design, IAM integration approach, and operational procedures
Assessment and recommendations for future state strategy, including options to consolidate, migrate, or decommission existing domains, with associated risks, dependencies, and a high‐level migration approach
Nice‐to‐Have Certifications
Microsoft Certified: Windows Server Hybrid Administrator Associate
Microsoft Certified: Identity and Access Administrator Associate (SC‐300)
Microsoft Certified: Azure Solutions Architect Expert
MCSA / MCSE (legacy but relevant)
Security certifications (e.g., CISSP, Security+, CISM)
Okta Certified Professional / Administrator (or similar IAM certifications)
We offer*:
Flexible working format - remote, office‐based or versátil
A competitive salary and good compensation package
Personalized career growth
Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
Active tech communities with regular knowledge sharing
Education reimbursement
Memorable anniversary presents
Corporate events and team buildings
Other location‐specific benefits
not applicable for freelancers
#J-*****-Ljbffr

📌 Lead Active Directory Engineer (Medellín)
🏢 N-Ix
📍 Medellín